[issue38334] zipfile: Seeking encrypted file breaks after seeking backwards

[Daniel Hillier]

Daniel Hillier <daniel.hillier at gmail.com> added the comment:

I also think that the `read_init` method in my PR is a useful refactor as it locates all the state that needs to be (re)set when starting a read into the same location.

At the moment this state is set in 1) __init__ and 2) the seek method when seeking back beyond what is in the buffer.

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<https://bugs.python.org/issue38334>
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